Rotary pump



PatentedNov. 23, 1943 lUNITED STATES PATENT clericsv I norsar PUMP s Arthur D. Hawmns, Minneapolis, Minn., assigner to Frank W. Griswold, Minneapolis, Minn.

Application November l2, 1940, Serial No. 365,305

3 Claims.

This invention relates to a pump and while the invention may have various applications it' is illustrated as embodied in a small hand pump for pumping oilor similar liquid.

It is an object of this invention to provide a simple and eilicient structure of pump which will have its inlet and outlet conveniently arranged, which will retain a certain amount of oil for priming and which will be in condition for operation after a considerable period ofdisuse.

- It is a further object of the invention to provide a pump having a casing with a cylindrical chamber therein, a rotor head in said chamber disposed eccentrically thereto, said head having slots at either side of a diametral plane together with a pair of blades in each of said slots which are urged outwardly against the wall of said casing.

It is also an object of the invention to provide a pump comprising a casing having a cylindrical chamber therein, a rotor in said casing disposed eccentrically to said chamber, said rotor having trunnion bearings at its ends journaled in bearings in said casing, together with means f or lubricating one of said bearings.

These and other objects and advantages of the invention will-be fully set forth in the following description made in connection with the accompanying drawings in which like reference characters refer to similar parts throughout the several views and in which:

Fig. 1 is a view in side eleva-tion of the pump embodying the invention;

Fig. 2 is a top plan view;

Fig. 3 is a vertical section takenV on line 3 3 of Fig. 2 as indicated by the arrows;

Fig. 4 is a vertical section taken on line t-A of Fig. 3 as indicated by the arrows;

Fig. 5 is a view of an .end bearing member shown in Fig. 4 and shown on an enlarged scale;

Fig. 6 is a vertical section taken on line E- of 1 Fig; 4 as indicated by the arrows:

Fig. '1 is a view in side elevation of a bearing plate used; y

Fig. 8 is a central vertical section of the plate shown in Fig. 7;

Fig. 9 is a vertical section taken on line @-9 of Fig. 3 as indicated by the arrows; and

Fig. 10 is a view inside elevation of the rotor head.

Referring to the drawings a pump is shown comprising a casing 2li. Casing 2d `has a central portion of substantially cylindrical form, the same beingl divided on a substantially` central line. Each section of the casing is provided with a ange a and these flanges are apertured to receive and be connected by a series of headed and nutted bolts 2l. Casing 20 has a cylindrical chamber 20h therein. A boss 20c is formed at the top of casing 20, the same being bored and threaded to receive a headed closing plug 22. Casing 20 has bearing portions 20d and 20e at opposite sides thereof. Said casing also has a lug or hub 20j at one side which has extending therethrough the inlet opening for the pump and is threaded to receive an inlet pipe 23. Said casing also has a hub or lug 20g at the side opposite lug 2W, which huby 20g has extending therethrough the outlet opening for the pump and will be constructed to receive an outlet conduit zt indicated in dotted lines in Fig. 1. Casing zc is counterbored at both sides about the bearing portions thereof and thin plates 25 shown in Figs. '1 and 8 are disposed in said counterbores. The inner surface of said plates 25 is substantially ush with the side walls of chamber 2Gb and said `plates have short cylindrical hubs which extend into the bearing portions 20d and 20e.

A rotor is provided comprising a head 2l which in practice has been formed as a die casting. Head 2l has a flange 21a at each side and the same has extending therethrough a pair of slots 2lb. Slots 2lb are shown as spaced equal distances from a diametrical plane of said head. Between the inner walls of slots 2lb is a chamber 21c. Chamber 21e is divided into three portions by partitions 2lb extending transversely of said chamber. Chamber 21e is open at one side of the head 2l and has a wall 21e at the opposite side of said head. The side portions of chamber ZIc have perforations 27j inthe wall 21e so that oil may drain therethrough. Head 2l has trunnions yZlg at each side and these are disposed inthe bearing hubs Zta and 20e of the casing 20. A plug 28` is disposed in the bored end of bearing hub 20e, said hub being counterboredA to receive a head on said plug. Plug 28 is threaded to receive a nut 29 which engages a washer or gasket 30 between the same and the outer end of hub 20e. One o the trunnions 21g has a stem 2lb journaledin plug 28. A plug 3l is threaded into the bore of plug 28 at the outer end of the latter, said plug having a small bore 3m extending therein from its outer end and being counterbored at its inner end to form a chamber 3H), which chamber has a tapering inner end wall. A compression coiledA s pring 32 is disposed in chamber Sib engaging the wall thereof at one end and engaging a. small plate 33 at its other end which normally closes the inner end of bore 3io. Plug 3| is formed -through the opening in lug 20e.

with a head and groove at its outer end adapted to receive the end of a grease gun or other greasing device. 'I'he other trunnion 21g has areduced portion 211 projecting therefrom and a further reduced portion or shaft 21j extends from portion 211. Trunnion 21g and extension 211 are disposed in bearing hub 20d as shown in Fig.v 4, the shoulder at the outer end of portion 21i engaging a shoulder in said hub. Shaft 211i projects through and beyond bearing hub 20d and has secured to its outer end a crankarm 35 having a hub secured to said shaft by a pin 36 or other suitable means. Crank arm 35 has a, handle 31 secured to its outer end by a stud-38 having its ends riveted, one of said ends being disposed in a counterbore in the outer side of handle 31v and vengaging a washer 39 in said counterbore. The outer end of hub 20d is bored and threaded to receive a packing gland 40 through which shaft 20j extends, said gland being adapted to engage packing material 4I disposed in hub 20d and surrounding shaft 217'. As shown in Fig. 3 the lower side of the outlet opening from chamber 20h is adjacent a diametral plane of said chamber and it will be seen that the lower side of the inlet opening to chamber 20h is also adjacent such a` diametral plane. The head 21 has reinforcing ribs 21k and 21m at each side, the-latter extending longitudinally vof said head and the former extending transversely thereof and tapering in thickness from rib 21m. Each slot 2lb has disposed therein a pair of blades 43 and 44. Blade 43 has recesses 43a formed therein and has portions 43b at the outer side of said recesses projecting beyond the portion between said recesses. Blades 44 each have recesses 44a. formed therein,

' the central portion 44h between said recesses extending beyond the portions at the outer sides of said recesses. Compression coiled springs 45 are disposed between each pair of blades having their ends respectively disposed in the recesses 43a and 44a. Blades 43 and 44 are shown as having their outer edges beveled at each side to form inverted V-shaped ends, the same engaging the cylindrical wall of chamber 2llb substantially in a line.

In operationthe pump will be assembled as shown in Figs. 1, 2 and 4. The head 21 as stated is eccentrically disposed to chamber 20h. -The blades 43 and 44 are urged away from each other by springs 45 and are thus resiliently held against the cylindrical wall of chamber 2Gb. Pipe 23 will lead to a supply of oil and the conduit 29 will extend' to the point of desired delivery. When crank 35 is turned in the direction of the arrow as shown in Fig. 1 the oil in chamber 21h will be moved by blades or vanes 43 or 44 to the outlet opening from said chamber and be discharged through conduit 24. By having the outlet 20g at the opposite side o1 casing 20 from the inlet the conduit 29 is in convenient position for the operator. The delivered oil comes toward the operator and he faces the conduit so thatl he vcan conveniently manipulate the same. By vthe disposition of the lower sides of the inlet and outlet openings as described it will be seen that there will be considerable oil retained in chamber 20h below said sides so that oil will always be present for priming said pump. The pump can be -initially or at any time primed by supplying oil The plates 25 are provided so that there will be little or no tendency for therotor to stick to the side walls of chamber 20h should the pump not be operated for a rather long period. In practice the plates 26 have been made from steel while the rotor head and casing 20 have been made from an aluminum metal 'or alloy. It will be seen that by having the chamber 21e between the blades that oil will be retained in the chambers thereof and will insure lubrication of the wall of chamber 20h. 'I'his oil can pass out at the open end of the central portion of chamber 21c against said wall and can pass through the perforations in wall 21e from the side portionsv of said chamber. The bearing 20e can be conveniently'lubricated by forcing oil or grease through the plug 3|.' It will be seen that there is some clearance between the periphery of the head of plug 28 and the surrounding vwall of hub 20e. The parts of casing 20 and changes may be made in the form, details, ar-

rangement and proportions of the parts, without departing from the scope of applicants invention, which generally stated, consists in a device capable of carrying out the objects above set forth, in the parts and combinations of parts disclosed andl defined in the appended claims.

What is claimed is: I

l. A pump for oil and similar liquid having in combination, a casing having a cylindrical chamber therein, bearings carried at either side of said casing having a common axis disposed at one side of the central axis of said chamber, a rotor head in said casing, trunnions secured to said head journaled in said bearings, said head having spaced parallel slots extending therethrough disposed at either side of a diametral plane thereof, a pair of blades in each of said slots, resilient means urging said blades outwardly against the cylindrical wall of said chamber, inlet and outlet openings for said casing disposed in horizontal alignment at opposite sides respectively of said casing rand chamber respectively and means for rotating said head.

2. The structure set forth in claim 1, the lower sides of said inlet and outletI openings being disposed in planes respectively adjacent the hori zontal vaxis of said cylindrical chamber whereby a body of oil will be retained in said chamber.

3. A pump for oil and similar liquid having in combination, a casing having a cylindrical chamber therein said chamber having an inlet opening and having an outlet opening disposed below said inlet opening, bearings carried at either side of said casing having a common axis disposed atk one side of the central axis of said? chamber, a rotor head in said casing having trunnions journaled in said bearings, said head having parallel spaced slots therebetween, a pair of oppsitely disposed blades in each of said slots, resilient means urging said oppositely disposed blades outwardly against the cylindrical wall of said chamber, said head having a slot betweensaid slots open to the cylindrical wall of said chamber at one end and having an opening through its other end through which oil may drain.

. lARTHUR D. HAWKINS, 

